John bowden and walter bowden



reitsh faire stenti @Him Letters Pate-nt No.V 74,884, dated February 25, 186.8.

1 inreovso sentons 6tlg-e rlgehultnfatn tu im tipa Elettra rtnit mn nuttig. and et ill? bnn;

To. ALL WLioM IT MAY concerns:

Be it'knmvnV that ive, Jenn BownnN and WALTnn Bownnmboth' of Bushwiek, in the countynV Kings, and f State of NewYork, have invented a newand useful Improvement in Bellows; and we. do hereby declare that i the following is a full, clear, and exact description 'ot' the same, 'reference beinghad to the accompanying drawing, making a poration of this specification, which is a vertical-longitudinal section of a bellows constructed according to our invention. j Y

"his invention'consists in a novel arrangement of valves and a`irpassages ina double-acting bellows, whereby all downwardly-opening valves, which invariably lose a portion of theair before closing, are avided; also in th application offa'yi'elding cover within or to the central chamber, whereby a steady'current of air is forced from the nozzle, regardless of the intermittent action of the bellows or forcing-'cliambers.

To enable others to understand the construction and operation of our invention, we will proceed todescribe it'n'ith reference tothe drawings.v i. I

A represents a central air-reservoir', the top, a,'ot` which, is connected with the sides thereof, by means of a flexible annular diaphragm, Z. Situatedin rfront; of this air-reservoir is a valve-chest, c, which communicates with the reservoir by .means of an opening, el, .which is provided `with aivalve, e. 4 Opening outward, and extend` ing forward from this valve-chest, is the tubular nozzlef. 4Formed behind the lreservoir is a passage, g, com-` -municating with such reservoir by means of anopening, 7L, furnished with an inwardly-opening valve, z'. The

bottom of the reservoir has an opening, k, furnished with a valve/,5111, which opens inward, l The uppermost of the air-forcing chambers is marked B, and the bottom, thereof, is fined over the reservoir A, and formed with an opening, r,l1'avii1g a valve, s, which .opens inward. The vibrating top, u, of the aforesaid-chamber, isihinged, as it were, to Atheiforwavrd end of' the'lbot,tom,'1t, thereof, the sides and rear end, w, of the said chamber, being formed of leather, in a manner similar to the corresponding parts of'an ordinary bellows. p Theothei air-forcing chamber of the apparatus is shown at C, and its bottom is formed by a vibrating-board, ne", hinged at its front end, as showniat a,'and,correspondingto theV top, at, .of the chamber B, the said board being united, by leathern. sides and end, to the bottom of the reservoirin`fthe same manner that the aforesaid vtop is connected with the bottom, n, of the chamberB. This hoard ai isvprovided with an opening, 1;*,iunrnished with an inwardlymoving valve, 0*, and its f ree andV rearmost end is. connected with the. corresponding end of the top, n, of the chamber B, by a cord,V d, so that when V'the top ofthe upperchamber is raised, a corresponding movement is communicatedto the board' d* 'ofthe-lower chamber C.` .A longslot or opening,'f*, is'pr'ovided in each side of the apparatus, in such manner as to permit the passage'of air tothe lopening r, in the bottom of the-'chamber B, and thence into the said chamber.y When the top, u, of the chamber B', and thae board afof'the chamber C, are simultaneously.moved` upward, as just mentioned, the 'air-is expelled from the chamber Cithrough the opening c, into the reservoir A, and. thencethrough the opening-cl to the nozzle f, the external air passing into the upper chamber B through the opening r, as herinbefore explained. The movement of the topA is then reversed,

and the air is forced from the chamber-B throughithe passage g and opening h, intothe reservoir, and thence to then'ozzle f, as hereinbefore enplained, the board a* descendingby its ownweight, so that the lower chamber is ,again filled withainpassing into the same through the' opening 6*,'tl1e several valves operating to allow or shut oi' the passage of air-throughtheir respective openings, according as the air is forced from one chamber or theyother to' the reservoir, and the exible diaphragm b allowing the interior of the reservoir to be enlarged 'or contracted, `according to the volume of air forced into on contained therein, so that byl these means the blast orcurrent of air through the nozzlcfis rendered uniform .and'continuous," Instead of being'malde of the `form shown in the drawings, the belloivs'may he of circular or other suitable or desired shape.

, What we claim as our invention, and desire to secure by Letters Patent, is-

1.' The` arrangement and combination of the valves 0*, s, z', m, and e, relatively to and with the forcing chambers C and B, and air-chamber A, substantially as set forth.

2; The cover a of Vthe air-chamber A," connected therewith by .an annular flexible diaphragm, arrangedfor operation in conncction with theforcing-chambersB and @substantially'as specified,

3.. The arrangement of the side-slots ff between the fixed and'yielding. covers of the air-chamber 1A, io'r admission of air to tbe forcing-chamber B, through valve s, substantially asshown and described.

Jennv BOWDEN, WALTER BoWDEN',

Witnesses: Y

J. W. CooMBs, G. W. REED. 

